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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

21965 results found.

  1. GRB060904B - SDSS Pre-Burst Observations
  2. GRB 060904: TAROT optical observations
  3. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  4. GRB060904 - SDSS Pre-Burst Observations
  5. GRB060901: Optical observations
  6. 060901: Swift UVOT followup observations
  7. GRB 060901: SMARTS optical/IR observations update
  8. GRB 060901: Swift/XRT Refined Analysis
  9. GRB 060901: SMARTS optical/IR observations
  10. GRB 060901: Swift/XRT Position
  11. GRB 060901: Watcher observations
  12. GRB 060605, observations using an Integral Field Unit
  13. GRB 060825: VLA observations
  14. GRB060826 - SDSS Pre-Burst Observations
  15. GRB060825: Liverpool Telescope optical observations
  16. GRB 060825: TNG optical observations
  17. GRB 060825: TAROT optical observations
  18. GRB 060825: P60 Observations
  19. GRB060825: BOOTES-IR optical observations
  20. GRB060801: host galaxy redshift
  21. Radio observations of GRB 060719
  22. GRB 060729, SMARTS optical/IR observations
  23. GRB 060814: Confirmation of IR afterglow
  24. GRB 060814: P60 Observations
  25. GRB 060814: P200 NIR Observations
  26. GRB 060814: Possible IR counterpart
  27. GRB060805B: optical observations
  28. GRB 060814: VLT optical limits
  29. GRB 060814 - SDSS Pre-Burst Observations
  30. GRB 060814: TAROT optical observations
  31. GRB051109B: Late-time Radio Observations
  32. Second VLA limit on new radio point source in SGR 1806-20
  33. GRB060807: Possible Highly Significant X-ray Emission Lines
  34. GRB060714: optical observations
  35. GRB 060729: An update on the Swift XRT and UVOT observations
  36. GRB060717: optical observations
  37. GRB060807: Optical limiting magnitudes
  38. GRB 060805B: XRT Team Analysis
  39. GRB 060807: K- and R-band observations
  40. GRB060806 = SGR1806-20
  41. GRB060807 - SDSS Pre-burst Observations
  42. GRB 060807: Kanazawa R-band observation
  43. GRB 060801: Second Epoch WSRT Radio Observations
  44. GRB060805 Liverpool Telescope observations
  45. GRB 060805: P60 Observations
  46. GRB 060805: KAIT observations
  47. GRB 060805 - SDSS Pre-Burst Observations
  48. GRB 060804: Swift UVOT observations
  49. GRB 060728: Upper limits of the X-ray emission
  50. GRB 060801: WSRT Radio Observations
  51. GRB060801: Radio Observations
  52. GRB 051109B: Bright spiral host galaxy at low redshift
  53. GRB 060801: optical observations at FORS2/VLT
  54. GRB 060801: optical observations at Hanle and Calar Alto
  55. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  56. GRB 060218 / SN 2006aj Nebular Spectrum
  57. GRB 060729 redshift
  58. GRB 060729: Swift/UVOT Observations
  59. GRB 060728, SMARTS optical/IR observations
  60. Swift/XRT preliminary analysis
  61. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  62. GRB 060714: Swift/UVOT Observations
  63. GRB060719: prompt NIR observations with REM
  64. GRB 060714: NOT observations
  65. GRB 060719: near-infrared afterglow
  66. GRB 060719: VLT/ISAAC observations
  67. GRB 060719: further analysis of VLT observations
  68. GRB 060719: prompt PROMPT observations
  69. GRB060719: REM NIR Observations
  70. GRB 060719: Continued LCO optical observations
  71. GRB 060719: VLT observations
  72. GRB 060719: LCO optical observations
  73. GRB060714: optical observations
  74. GRB 060717: NOT observations
  75. GRB060717 - SDSS Pre-burst Observations
  76. GRB 060714: REM infrared observations
  77. GRB060714: optical observations
  78. GRB 060714 : Liverpool Telescope Observations
  79. GRB 060708: VLT spectroscopy
  80. GRB060708: MARGE low resolution spectrum observations
  81. GRB060714: optical observations
  82. GRB 060605: SkyNet Optical Limits
  83. GRB060712: P60 Observations
  84. GRB 060712: Swift/UVOT Upper Limits
  85. GRB060526: optical observations
  86. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  87. GCN 060708: Swift-UVOT Observations
  88. GCN 060707: Swift-UVOT observations
  89. GRB 060707: BOOTES-IR optical observation
  90. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  91. GRB 060515: Upper Limit on Host Galaxy
  92. GRB 050223: Magellan redshift
  93. GRB 060614: SMARTS host galaxy observations
  94. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  95. GRB 060109: Upper Limit on Host Galaxy
  96. GRB 060105: Upper limit on Host Galaxy
  97. GRB060614: Detection of the host galaxy but no supernova emission
  98. GRB 060614: Redshift
  99. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  100. GRB060614: Optical observations

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